Etymology
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exertion (n.)

1660s, "act of exerting," from exert + -ion. Meaning "vigorous action or effort" is from 1777.

updated on November 07, 2012

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Definitions of exertion from WordNet

exertion (n.)
use of physical or mental energy; hard work;
they managed only with great exertion
Synonyms: effort / elbow grease / travail / sweat
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.